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    <title>Document</title>

    <script>

        var  sg = prompt("请输入您要查询的水果")

        switch (sg) {

            case"苹果":

                alert("苹果2元/斤")

                break

            case"榴莲":

                alert("榴莲10元/斤")

                break

            case"香蕉":

                alert("香蕉5元/斤")

                break

            default:

                alert("没有这个水果")

                break

        }

    </script>

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